HP 34901A 20 Channel Multiplexer (2 / 4 -wire)

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The HP 34901A is the most versatile multiplexer for general purpose scanning. It combines dense, multi-function switching with 60 channel/second scan rates to address a broad spectrum of data acquisition applications.

Two- and four-wire channels can be mixed on the same module. Two additional fused inputs (22 channels total) route up to 1A of current to the internal DMM, allowing ac and dc current measurements without the need for external shunt resistors.


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Module Specifications

The HP 34970A accuracy specifications already include the
switching offset and reference junction errors shown below.
These errors are listed separately for determining system error with
external measurement devices.  Up to three modules, in any
combination, can be inserted into a single mainframe. The HP 34970A's
internal DMM connections are accessible only through the HP
34901A, HP 34902A, and HP 34908A low-frequency multiplexers.
On-module screw terminals accept wire sizes from 16 gage to 22 gage.
20 gage wire is recommended for high channel count applications.









HP 34901A 20-Channel Multiplexer






GENERAL







Number of Channels


20 + 2

2- wire and 4- wire






Connects to Internal DMM


YES






Scanning Speed


60 ch/s






Open/Close Speed


120/s






INPUT







Voltage (dc, ac rms)


300V






Current (dc, ac rms)


1A






Power (W, VA)


50W






DC CHARACTERISTICS







Offset Voltage[1]


<3µV






Initial Closed Channel R[1]


<1 Ohm






Isolation ch-ch, ch-earth


>10 G Ohm






AC CHARACTERISTICS







Bandwidth


10 MHz






ch-ch Cross Talk


-45 db






Capacitance HI - LO


<50 pF






Capacitance LO -Earth


<80 pF






Volt-Hertz limit


108






OTHER







T/C Cold Junction Accuracy[1] 
(typical)


0.8°C






Switch Life No Load (typical)


100M






Switch Life Rated Load (typical)[2]


100k






Temperature Operating


0°C to 55°C






Temperature Storage


-20°C to 70°C






Humidity (non-condensing)


40°C / 80% RH





[1] Errors included in DMM measurement accuracy
specifications

[2]Applies to resistive loads only















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HP 34901A       20 Channel Multiplexer (2 / 4 -wire)



Related Modules
HP 34902A       16 Channel Multiplexer (2/4 -wire)
HP 34903A       20 Channel Actuator/GP Switch
HP 34904A       4 x 8 Matrix
HP 34905A       2 GHz Dual 1:4 RF Mux, 50 ohm
HP 34906A       2 GHz Dual 1:4 RF Mux, 75 ohm
HP 34907A       Multifunction Module
HP 34908A       40 Channel Single-Ended Multiplexer




  


Available accessories for this product include:






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No literature is available online at this time.



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Related HP 34970A Data Acquisition/Switch Unit product datasheets:




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Page Updated: Friday February 05 09:13:18 UTC 1999